CHANNEL SPREADING DEVICE AND METHOD IN CDMA COMMUNCHANNEL SPREADING DEVICE AND METHOD IN CDMA COMMUNICATION SYSTEM ICATION SYSTEM

摘要

A demodulation method in a mobile station having a plurality of channels, fo r receiving a signal from a base station. In one aspect, the base station has a plurality of channels, a BPSK spreader for orthogonal ly spreading symbol data of each channel with an assigned orthogonal code, and a QPSK spreader for PN-spreading the orthogonally sprea d signal with a PN code. In another aspect, the base station has a plurality of channels, a QPSK spreader for spreading symbol data of ea ch channel by the real and imaginary parts of its assigned orthogonal code, and a QPSK spreader for PN-spreading the orthogonally sprea d signal with a PN code. During the orthogonal despreading, the complex conjugate of the estimated pilot channel value is multiplied by the orthogonally despread signal, for compensation.